CN100423058C - Organic electroluminescent picture element circuit - Google Patents

Organic electroluminescent picture element circuit Download PDF

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Publication number
CN100423058C
CN100423058C CN 02104665 CN02104665A CN100423058C CN 100423058 C CN100423058 C CN 100423058C CN 02104665 CN02104665 CN 02104665 CN 02104665 A CN02104665 A CN 02104665A CN 100423058 C CN100423058 C CN 100423058C
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organic el
transistor
pixel
el element
driving
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CN 02104665
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CN1375810A (en
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古宫直明
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三洋电机株式会社
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/04Structural and physical details of display devices
    • G09G2300/0439Pixel structures
    • G09G2300/0465Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00Aspects of the constitution of display devices
    • G09G2300/08Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809Several active elements per pixel in active matrix panels
    • G09G2300/0842Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G09G2300/0861Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243Details of the generation of driving signals
    • G09G2310/0251Precharge or discharge of pixel before applying new pixel voltage
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243Details of the generation of driving signals
    • G09G2310/0254Control of polarity reversal in general, other than for liquid crystal displays
    • G09G2310/0256Control of polarity reversal in general, other than for liquid crystal displays with the purpose of reversing the voltage across a light emitting or modulating element within a pixel
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00Control of display operating conditions
    • G09G2320/02Improving the quality of display appearance
    • G09G2320/0257Reduction of after-image effects
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation
    • G09G2330/021Power management, e.g. power saving

Abstract

本文涉及防止在有机EL元件上产生残余图像的方法。 This article relates to a method of preventing generation of residual images on the organic EL element. 为此设置放电用晶体管TFT3和控制晶体管TFT4,前者用于与有机EL元件EL的上侧端和负电源VEE连接,后者把保持电容SC的上侧端连接在电源PVDD上。 For this purpose, the discharge transistor and the control transistor TFT3 TFT 4, the former for the side end of the organic EL element EL is connected and the negative power supply VEE, which the storage capacitor SC is connected to the upper end of the power supply PVDD. 通过由前段的选通线使这些TFT3、4导通,在选择自身的线之前,使有机EL元件EL的电容进行放电。 By the pre-stage gate line is turned on so that these TFT3,4, before selecting the line itself, the organic EL element EL discharges the capacitor.

Description

有机场致发光像素电路 Organic pixel circuit

技术领域 FIELD

本发明涉及对有机场致发光(EL)像素所加的驱动电压进行控制的有机EL像素电路。 The present invention relates to an organic pixel driving voltage applied electroluminescence (EL) for controlling the organic EL pixel circuit. 背景技术 Background technique

历来,大家知道作为平板显示的有机EL屏。 Historically, we know that the organic EL display panel as a tablet. 由于该有机EL屏的各像素自发光,所以其优点是不要像液晶那样地背射光等,可以实现明亮的显示。 Since each pixel of the light emission from the organic EL panel, so the advantage is not as back light or the like emitted to the liquid crystal image can be achieved bright display.

图8示出利用传统的薄膜晶体管(TFT)的有机EL屏内的像素电路的构成例。 FIG 8 shows a configuration example of the pixel circuit in using the conventional thin film transistor (TFT) organic EL panel. 有机屏是把这类像素矩阵配置而构成。 The organic pixel matrix screen of such configuration is to be configured.

在行方向伸延的选通线上连接作为通过选通线选择的n沟道薄膜晶体管的选择晶体管TFT1 (以下单称为TFT1)的栅极。 Extending in the row direction of the gate line connected to an n-channel thin film transistor through the gate line selection is a selection transistor TFT1 (hereinafter, simply referred to as TFT1) gate. 在该TFT1的漏极上连接列方向伸延的数据线,在其源极上连接另一端连接在保持电容电源线上的保持电容SC。 In the column direction are connected on the drain of the TFT1 extending data lines connected to the storage capacitor SC is connected to the other end of the storage capacitor power supply line on its source. 此外,在TFT1的源极和保持电容SC的连接点连接在作为P沟道薄膜晶体管的驱动晶体管TFT2 (以下单称为TFT2)的栅极上。 Further, the TFT1 source connection point and the holding capacitor SC is connected to the gate of the transistor TFT2 (hereinafter, simply referred to as TFT2) as a P-channel thin film transistor. 而且,该TFT2的源极连接在PVDD上,漏极连接在有机EL元件EL上。 Further, the source of the TFT2 is connected on the PVDD, a drain connected to the organic EL element EL. 而有机EL元件EL的另一端连接在阴极电源CV上。 And the other end of the organic EL element EL is connected to a cathode power source CV.

因此,选通线在H电平时TFT1导通,这时的数据线的数据保持在保持电容SC上。 Thus, the gate lines usually TFT1 is turned H level in the data holding time of the data lines in the storage capacitor SC. 而且,根据维持在该保持电容SC上的数据(电位), TFT2被通断,在TFT2导通时,在有机EL元件上流过电流、发光。 Further, according to maintain the storage capacitor SC in the data (potential), TFT2 is turned on and off when the TFT2 is turned on, the current flows through the organic EL element, light emission.

这样一来,控制各像素的发光。 Thus, controlling the light emission of each pixel. 由于有保持电容,所以在TFT1断开后也有可能有机EL元件EL发光。 Because the storage capacitor, so the TFT1 is also possible to disconnect the organic EL element EL emits light. 通常直到选择下一条选通线,保持电容维持TFT2导通或断开。 Typically a selection until the next gate line, the storage capacitor is maintained TFT2 turned on or off.

发明内容 SUMMARY

在这里,在利用如上述所示的TFT的有机EL屏上,在矩阵状配置的各像素在包含有机EL元件、TFT1、 TFT2的同一基极上叠层形成。 Here, as shown in the above-described TFT using an organic EL panel, arranged in a matrix form in each of the pixels comprising an organic EL element, TFT1, TFT2 base on the same stack. 因此,在有机EL元件EL上产生寄生电容。 Thus, a parasitic capacitance on the organic EL element EL.

因此,即使TFT2处于断开状况,根据有机EL元件持有的电容上储存的电荷,有机EL元件EL上也有电流流过,产生所谓残余图像的问题。 Thus, even if the TFT2 in the off condition, the charge storage capacitor according to the organic EL element is held, there are current flows through the organic EL element EL, a so-called residual image problem. 即,使有机EL元件导通时以高速响应动作,然而在有机EL元件断开时由于受有机EL的电容的影响响应变慢,残余图像的问题依然存在。 In response to a high speed operation, however, when the organic EL element is turned off due to capacitance effects of the slow response time of the organic EL i.e., the organic EL element is turned on, the residual image problem still exists. 本发明的目的是鉴于上述传统的缺点,提供可以有效地防止残余图像的发生的有机EL像素电路。 Object of the present invention in view of the above conventional disadvantages and to provide possible to effectively prevent the pixel circuits of the organic EL residual image. 本发明的特征是在控制对有机EL像素所加驱动电压的有机EL像素电路上具有放电用晶体管,用于对在有机EL元件上产生的电容上储存的电荷进4亍;^:电。 Feature of the present invention is a discharge transistor in a pixel circuit for controlling the organic EL pixel of the organic EL driving voltage applied for the charge stored on the capacitance generated on the organic EL element 4 into the right foot; ^: electricity. 这样,根据本发明,通过放电用晶体管可以使有机EL的电容上储存的电荷放电。 Thus, according to the present invention, can be made by discharging the charge stored on the capacitance of the organic EL discharge transistor. 因此,可以防止在有机EL元件从导通变为断开时通过有机EL的电容上储存的电荷保持导通状态,产生残余图像。 Thus, it is possible to prevent the charge stored in the capacitor through the organic EL element when the organic EL is turned off from the ON state is kept turned on, to generate a residual image. 前述有机EL像素实施矩阵配置,行方向的各像素通过同一选通线选择,前述放电用晶体管,通过以比选择自身的行更早的定时选择的选通线,进行驱动,使在有机EL的电容上储存的电荷进行放电是合适的。 The organic EL pixels arranged in a matrix embodiment, the pixels of each gate line selected by the same row direction, the discharge transistor, by selecting the gate line than their earlier selection timing of the row, is driven so that the organic EL the charge storage capacitor discharge is appropriate. 因此,预先对有机EL的电容进行放电,防止确实的残余图像的发生。 Thus, the capacitance of the organic EL previously discharged, to prevent the occurrence of residual image does. 前述放电用晶体管,通过以比选择自身的行更前的定时激励的放电专用线,进行驱动,使有机EL的电容上储存的电荷进行放电是合适的。 The discharge transistor, by selecting than their more rows of the discharge timing of the dedicated lines prior to excitation, is driven, the charge stored on the capacitance of the organic EL discharge is appropriate. 各像素具有保持电容,用于保持对驱动晶体管的控制电压,该驱动晶体管用于控制对有机EL元件所加的驱动电流,还具有控制晶体管,用于控制该保持电容上保持的控制电压是合适的。 Each pixel has a storage capacitor for holding a control voltage of the driving transistor, the driving transistor for controlling the organic EL element drive current applied, also has a control transistor for controlling the control voltage holding capacitor holding the appropriate of. 因此,通过由控制晶体管进行放电,可以使驱动晶体管断开。 Accordingly, by discharging the control transistor, the driving transistor can be turned off. 前述控制晶体管在与前述放电晶体管同时驱动的放电晶体管驱动时,使驱动晶体管断开是合适的。 When the control transistor and the discharge transistor driven simultaneously driving the discharge transistor, the driving transistor is turned off is appropriate. 由此,维持显示期间,使配线缩短, 防止确实的残余图像的发生。 Accordingly, a display sustain period, to shorten the wiring, prevent the occurrence of residual image does. 而且,可以防止驱动晶体管和放电用晶体管用时导通。 Further, it is possible to prevent the driving transistor is turned on and the discharge transistor. 前述控制晶体管在比前述放电用晶体管之前驱动的放电晶体管驱动前,使驱动晶体管断开是合适的。 The control transistor in the pre-discharge ratio of the discharge transistor driven before driving transistor, the driving transistor is turned off is appropriate. 由此可以防止确实的驱动晶体管和放电用晶体管同时导通。 Indeed possible to prevent the discharge transistor and the drive transistor are simultaneously turned on. 前述有机EL像素实施矩阵状配置,各像素以各自预定的色发光, 而且在以发光效率高的色发光的像素内配置对以发光效率低的色发光的像素的放电晶体管和/或控制晶体管是合适的。 The organic EL pixels embodiment arranged in a matrix, the respective pixels at respective predetermined light emission, and the configuration of the low luminous efficiency of light emission of the pixel of the discharge transistor and / or the control transistor within the high luminous efficiency of light emission of pixels is suitable. 例如,在各像素以RGB For example, in each pixel in RGB

(红、绿、兰)发光时,在有机EL元件,R的发光效率差,G的发光效率低。 (Red, green, blue) light emitting organic EL element, the difference in luminous efficiency of R, G, luminous efficiency is low. B处于R和G的中间。 R B and G in the middle. 因此,通过对R的放电用晶体管或控制晶体管,或其双方配置在G的像素内,可以提高R像素的数值孔径。 Thus, by the R discharge control transistor or a transistor, or the two sides arranged in the pixel G, R can increase the numerical aperture of the pixel. 由此由于可以提高发光效率低的像素(例如R)的数值孔径,抑制驱动电压的上升,所以有可能降低整体的电力消耗。 Since whereby luminous efficiency can be improved low pixel (e.g., R), the numerical aperture, suppress an increase in driving voltage, he is possible to reduce the overall power consumption.

本发明提供了一种有机EL像素电路,其特征为,各像素上设有选择像素的选择晶体管;对有机EL元件所施加的驱动电流进行控制的驱动晶体管;以及使在前述有机EL元件中产生的电容上储存的电荷进行放电的放电用晶体管,前述驱动晶体管的一端连接到前述有机EL元件,前述放电用晶体管的一端连接到EL元件和前述驱动晶体管之间。 The present invention provides an organic EL pixel circuit, wherein, with selected pixels of each pixel selection transistor; on the drive current applied to the organic EL element driving transistor for controlling; and produced in the organic EL element the stored charge on the capacitor is discharged discharge transistor, one end of the driving transistor connected to the organic EL element, the EL element is connected between the discharge of the driving transistor and the one end of the transistor.

本发明还提供了一种有机EL像素电路,其特征为,各像素具有选择像素的选择晶体管;对供给有机EL元件的驱动电流进行控制的驱动晶体管;以及用于保持对驱动晶体管的控制电压的保持电容,该驱动晶体管用于对前述有机EL元件所施加的驱动电流进行控制, The present invention also provides an organic EL pixel circuits, wherein each pixel has a selection transistor selecting a pixel; driving current supplied to the organic EL element is driven control transistor; and a control voltage for maintaining the driving transistor retention capacitor, the drive transistor for driving current applied to the organic EL element is controlled,

另外还有控制晶体管,用于控制在该保持电容上保持的控制电压而使前述驱动晶体管断开。 There is also a control transistor for controlling the holding of the control voltage holding capacitor so that the driving transistor is turned off.

附图说明 BRIEF DESCRIPTION

图1是示出实施形态构成的图。 1 is a diagram showing the configuration of the embodiment.

图2是示出实施形态动作的定时图。 FIG 2 is a timing diagram illustrating the operation of the embodiment of FIG.

图3是示出其它实施形态构成的图。 3 is a diagram illustrating another embodiment of the configuration of FIG.

图4是示出其它实施形态的定时图。 FIG 4 is a timing diagram illustrating another embodiment.

图5是示出另一其它实施形态构成的图。 FIG 5 is a diagram showing another embodiment of another configuration.

图6是示出另一其它实施形态动作的定时图。 FIG 6 is a timing diagram illustrating operation of another embodiment of another.

图7是示出另一其它实施形态构成的图。 7 is a diagram showing another embodiment of another configuration.

图8是示出现有实施例构成的图。 FIG 8 is a diagram illustrating the configuration has embodiment.

具体实施方式 Detailed ways

以下根据附图说明本发明的实施形态。 The following drawings illustrate embodiments of the present invention.

图1是示出本实施形态1的像素部分的像素电路的构成图。 FIG 1 is a configuration diagram showing a pixel circuit of the present embodiment 1 of the pixel portion. 在水平方向伸延的选通线上连接由n沟道TFT构成的TFT1。 Extending in the horizontal direction gate line connected TFT1 TFT formed of an n-channel. 该TFT1作为与TFT串联的双栅TFT形成。 The TFT TFT1 and as a dual-gate TFT is formed in series. 然而也不一定构成双栅。 However, it does not necessarily constitute a double gate.

而且,在该TFT1的另一端上,连接保持电容SC的一端。 Further, at the other end of the TFT1 is connected to the end of the holding capacitor SC. 保持电容SC的另一端连接在作为脉沖负电源的VEE上。 The other end of the storage capacitor SC is connected to the negative supply a pulse VEE. 在TFT1和保持电容SC的连接点上,连接由P沟道TFT形成的驱动晶体管TFT2的栅极。 TFT1 at the connection point and the storage capacitor SC is connected to the gate of the driving transistor TFT2 is formed of a P-channel TFT. 该TFT2是由2只TFT并联构成。 The TFT2 is constituted by two TFT connected in parallel. 而且,TFT2的一端连接在脉沖电源PVDD 上,另一端连接在有机EL元件EL上。 Further, one end of the TFT2 is connected to the PVDD pulsed power supply, the other end is connected to the organic EL element EL. 有机EL元件的另一端连接在设置于反对侧基板上的阴极上。 The other end of the organic EL element is connected to the side of the substrate provided in opposition to the cathode. 而且,在TFT2和有机EL元件EL的连4矣点上,连接在另一端连接在VEE上的放电晶体管TFT3的一端上,该放电晶体管TFT3的栅极连接在前段的选通线上。 Further, even in a 4-point carry TFT2 and the organic EL element EL, connected to one end and the other end connected to the discharge transistor TFT3 is VEE, the gate of the transistor TFT3 is connected to the discharge gate line in the previous stage. 即,在图的左上像素的TFT3上,与其连接在连接自身的像素的TFT1的选通线1,不如连接在水平线上的选通线0上。 That is, in the upper left pixel of FIG. TFT3, itself connected thereto in a pixel connected TFT1 gate line 1, as a horizontal line connecting the gate line 0. 在TFT1和保持电容SC的连接点上,连接控制晶体管TFT4的一端, 该TFT4的另一端连"t妄在电源PVDD上。而且,该TFT4的栅极与前述的TFT3同样连接在前段的选通线上。在这样的有机EL像素电路上通过垂直驱动器,使选通线导通。即, 在由垂直同步信号规定的1画面显示,根据水平同步信号,与实施显示的水平线对应的选通线顺序导通。通过水平驱动器,在1条选通线导通的1水平期间,数据线顺序与视频信号连接,根据各像素的数据经TFT1,提供给TFT2的栅极及保持电容SC。因此,数据的附加基本上构成点顺序。而且,所加的数据在保持电容上储存,即使在数据附加终止后,TFT2导通或断开状态也继续保持。而且,在该TFT2导通时,从电源PVDD来的电流在有机EL元件EL内流过,使其发光。在本实施形态,TFT2是P沟道型,在保持电容SC上保持电荷在H 电平时断开,电荷;改电 TFT1 at the connection point and the storage capacitor SC is connected to one end of the control transistor TFT4 and the TFT4 other end connected "t jump in the power supply PVDD. Further, the gate of the TFT4 is connected to the front stage TFT3 same gate line. on such an organic EL pixel circuit through a vertical actuator so that the gate line is turned on. That is, in a screen specified by the vertical synchronizing signal is displayed, the horizontal synchronization signal, a horizontal line corresponding to the gate line and the embodiment shown are sequentially turned on by a horizontal driver, during a horizontal gate line is turned on, the data line sequential video signal connection, according to the data of each pixel through the TFT1, to the gate of the TFT2 and the storage capacitor SC. Thus, additional data substantially constituting the point sequence. Further, the added data is stored in the holding capacitor, even after the termination of the additional data, TFT2 oN or OFF state is maintained. Further, when the TFT2 is turned on, the power supply to PVDD current flows in the organic EL element EL through to emit light in the present embodiment, a P-channel TFT2 is held in the charge storage capacitor SC is disconnected at the H level, the charge;. to electricity L电平时导通。在本实施形态,由于有TFT3,该TFT3通过前段的选通线导通。 即,在有机EL元件EL的上侧,即TFT2的漏极,在TFT1导通的1水平线前的阶段,连接在负电源VEE上。而且,使储存在有机EL元件EL 的电容上的电荷放电。因此,选择自身的选通线,写入的数据是黑的, 在TFT2断开时,在有机EL元件EL内没有电流流过,可以可靠地防止残余图像的发生。例如,如图2所示,在选通线0导通时,连接在通过选通线1导通的TFT1上的TFT4以及连接在EL上的TFT3导通。由此,使储存在选通线1的线的像素的有机EL元件EL的电容上的电荷放电。此外,在选通线1导通时,对选通线2的线的像素的TFT3导通,使储存在该像素的有机EL元件EL的电容上的电荷放电。而且,这样的动作对各线顺序反复进行。 L level is turned on. In the present embodiment, since there TFT3, the TFT3 passing through the front gate line is turned on. That is, on the side of the organic EL element EL, the drain of the TFT2 i.e., turned in the horizontal line TFT1 before the stage, is connected to the negative power supply VEE. Furthermore, the charge stored on the capacitance of the organic EL element EL discharge. Therefore, their selection gate line, the data is written to black, when the TFT2 disconnected, not the organic EL element EL current flows, can be reliably prevented occurrence of residual images. For example, as shown in FIG. 2, when the gate line 0 is turned on through the gate connected to wire 1 is turned TFT1 TFT4 and the TFT3 is connected to the EL is turned on. thus, the organic EL element EL pixel line stored in the line 1, the gate of the charge on the capacitor is discharged. Further, when a gate line is turned on is selected from the pixel lines 2 lines TFT3 is turned on so that the charge stored on the organic EL element EL of the pixel capacitance is discharged. Further, such an operation is repeated sequentially for each line.

图3所示的是另外的的实施形态。 It is another form of the embodiment shown in FIG. 在该例,TFT4的另一端不是连接在前段的选通线,而是连接在前前段的选通线上。 In this embodiment, instead of connecting the other end of the TFT4 is in the pre-stage gate line, but connected to the front gate line preceding stage. 由此,在首先选择前前的水平线时,保持电容被PVDD充电,TFT2已经断开。 Accordingly, when the horizontal line before the previous selected first holding capacitance is charged PVDD, TFT2 has been disconnected. 而且, 在选择前段的水平线时,TFT3导通,有机EL的电容进行放电。 Further, when selecting the preceding horizontal line, TFT 3 is turned on, the capacitance of the organic EL discharge. 通过这种构成,可以更可靠地防止TFT2和TFT4同时导通。 With this configuration, it is possible to more reliably prevent TFT4 and TFT2 ON simultaneously.

例如,如图4所示,在选通线0导通时,选通线1的像素的TFT3 和选通线2的像素的TFT4导通,在选通线1导通时,选通线2的像素的TFT3和选通线3的像素的TFT4导通。 For example, as shown, when the gate conduction line 0, pixel TFT3 pixel gate line 1 and the gate of TFT4 line 2 is turned on when a gate line is turned on, the gate line 24 TFT4 guide TFT3 pixel and the pixel gate line 3 pass. 这样一来,在各像素,首先TFT4导通,保持电容SC放电,TFT2导通,其次TFT3导通,保持电容SC放电,TFT2断开,其次TFT3导通,有机EL的电容放电,其次TFT1 导通,写入数据。 Thus, in each pixel, first TFT4 turned storage capacitor SC discharges, turned TFT2, TFT3 is turned on secondly, the storage capacitor SC discharges, disconnecting TFT2, TFT3 is turned on secondly, the organic EL capacitive discharge, followed by conducting TFT1 pass write data.

TFT3、 4的导通定时不一定在前段、前前段,也可以在比其更前。 TFT 3, 4 is turned in the front stage of the timing is not necessarily, before the pre-stage, may be more than before. 即TFT3、 4的导通定时也可以比该段的选通线更前选择的选通线的信号,TFT4的导通定时也可以与TFT3的导通的定时相同或比其更前。 I.e. TFT3 on timing, may be selected. 4 lines than the segment forward of the gate line selection signal, turn-on timing may be timing TFT4 TFT3 is turned on before the same or more than that. 可是,采取尽可能紧邻之前的方案,可以更长地维持EL元件的导通期间。 However, immediately before taking the possible solutions, can be maintained for longer conduction period of the EL element. 此外,为此的配线也可以缩短。 In addition, for the wiring can be shortened.

这样,根据本实施形态,由于设置了TFT3,在有机EL从导通变为断开时,可以可靠地断开,可以防止残余图像的发生。 Thus, according to the embodiment, since the TFT 3, when turned off from ON, the organic can be reliably disconnected the EL, it is possible to prevent the occurrence of residual images. 此外,由于设置了TFT4,因而可以防止在TFT3导通期间,因TFT2导通而使TFT4 与电源PVDD和负电源VEE连接。 Further, since the TFT4, can be prevented during the TFT3 is turned ON due to the TFT4 TFT2 connected to the negative power supply PVDD and VEE.

在最上段的水平线上,没有前段、前前段的选通线。 Horizontal line uppermost without preceding, before the preceding gate line. 因此,也可以引回从最下段以及其上的选通线来的配线,设置在垂直回描(桢回描)期间导通的虚设(dummy)的(没有对应像素)选通线,由此也可以使TFT3、 4导通。 Thus, it may be led back wiring from the gate line lowermost section, and thereon to, and disposed in a vertical retrace conduction period (Jeong blanking) of the dummy (dummy) (no corresponding pixel) gate line, from this can also TFT3, 4 is turned on.

如图5所示的是又一另外的实施形态,在该例,为了使TFT3、 4 导通,设置了专用的放电专用选通线,各段的TFT3、 4的栅极连接在各自的段的放电专用选通线上。 FIG 5 is yet another further embodiment, in the embodiment, in order to make TFT3, 4 is turned on, dedicated set of dedicated discharge gate line, the gate of each segment TFT3, 4 is connected to a respective segment discharge dedicated gate line.

而且,如图6所示,由于各段的放电专用选通线与前一段的选通线同时导通(激励化),所以在与图1的实施例同样,在前段的选通线变为导通的定时,TFT3、 4导通。 Further, as shown in FIG 6, since the section of the discharge gate line dedicated to the preceding paragraph gate lines are simultaneously turned on (excitation of), so that the same, in the pre-stage gate line becomes the embodiment of FIG. 1 conduction timing, TFT3, 4 is turned on. 使TFT3、 TFT4连接在另外的放电专用选通线上,使其一方连冲妄在选通线上,也可以利用别的定时使TFT3、 TFT4导通。 That the TFT 3, the TFT 4 connected to a further discharge dedicated gate line, so even the red jump in one gate line, may also be utilized with different timing so TFT3, TFT4 are turned on. 如图7所示的是又一另外的实施形态,在该例,对TFT3、 TFT4的配置场所想了些办法。 FIG 7 is shown a yet further embodiment, in the embodiment, a TFT 3, the TFT 4 is disposed want to place some way. 在图7,显示3个像素,左上是R(红色),右上是G(绿色),左下是B(兰色)。 In Figure 7, three pixels, the upper left is R (red), the upper right is a G (green), the lower left is a B (blue). RGB的像素配置也可以不是这样的配置,而是在列方向相同色并置的条型或其它类型配置。 The RGB pixel arrangement may not be such a configuration, but the same color in the column direction of juxtaposed strips or other types of configurations. 而且,在本实施形态,R像素的TFT3、 TFT4配置在邻接的G像素的内部。 Further, in this embodiment, R pixel TFT 3, the TFT 4 is disposed inside the adjacent G pixels. 因此,R像素内配置的TFT数比G像素内的TFT数少。 Thus, the number of TFT arranged in the pixel R is smaller than the number of the G pixel TFT. 假如配置TFT,则由于唯独那个像素的数值孔径变小,所以在本实施形态R 像素的数值孔径比G像素的数值孔径更大。 If the TFT configuration, since except that the numerical aperture of the pixel is small, the numerical aperture in the present embodiment, a pixel R G is larger than the numerical aperture of the pixel. 在有机EL元件EL,通常G的发光元件发光效率高、明亮,R的发光元件的发光效率低、暗淡。 In the organic EL element EL, the light emitting element of high light emission efficiency of G is usually bright, low emission efficiency of the light emitting elements R, dim. 如本实施形态所示,通过提高R发光的像素的数值孔径,降低G发光的像素的数值孔径,可以通过数值孔径补偿发光效率之差,作为整体可以降低耗电。 As shown in this embodiment, by improving the numerical aperture of the light-emitting pixels R, G reducing the numerical aperture of the light emitting pixels, the difference in emission efficiency by the numerical aperture of the compensation, the power consumption can be reduced as a whole. 通过有机EL元件的材料,即使也考虑发光效率各异的情形,也可以把该情况下发光效率低的色的像素的TFT配置在发光效率高的像素内。 TFT by the material of the organic EL element, light emission efficiency even consider different situations, and this may be the low light emission efficiency of the color pixels arranged in a pixel high luminous efficiency. 此外,在图7,把1个像素U像素)的TFT3、 TFT4双方配置在另外的像素(G像素)内,也可以只是TFT3、 TFT4的任何一方。 Further, in FIG. 7, the pixel U 1 pixel) TFT3, TFT4 both disposed within another pixel (G pixel), but may be any party TFT 3, the TFT 4. 该图7作为电路图只示出配置,个别构件的配置大小等与实际的不同。 FIG. 7 shows only a circuit diagram of a different configuration, the configuration and size of the actual individual member. 此外,在图上各像素的划分由虚线表示。 Further, in FIG dividing each pixel is represented by a dotted line. 各晶体管的极性不限于上述各实施形态的例子,也可以用相反的例子。 The polarity of each transistor is not limited to the above-described example of each of the embodiments, the opposite case may also be used. 在该种情况下信号也形成相反的极性。 Signal of opposite polarity is also formed in this case. [发明的效果]如以上说明所示,根据本发明,通过放电用晶体管,可以使在有机EL电容上储存的电荷放电。 [Effect of the Invention] As explained above, according to the present invention, the discharge transistor, the charge can be stored on the organic EL capacitive discharge. 因此,有机EL元件从导通变为断开时, 可以防止通过在有机EL的电容上储存的电荷保持导通状态产生残余图像。 Thus, the organic EL element is turned off from the turn-on can be prevented by the charge stored in the capacitor holding the organic EL residual image conducting state. 通过由自身的行的前段的选通线驱动放电用晶体管,预先实施有机EL的电容的放电,防止确实的残余图像的发生。 Driven by the pre-stage gate line itself row discharge transistor, the capacitance of the organic EL discharge in advance, prevent the occurrence of residual image does. 通过由控制晶体管使前述驱动晶体管断开,实施由放电晶体管产生的放电时,可以使驱动晶体管断开。 Through the control transistor so that the driving transistor is turned off, discharge was generated by the discharge transistor, the driving transistor can be turned off. 通过使发光效率低的色的像素的放电晶体管或控制晶体管配置在发光效率高的色的像素内,可以补偿各色的发光效率。 By a low light emission efficiency of the discharge transistor color pixels disposed in a control transistor or a high luminous efficiency of color pixels, each color light emission efficiency can be compensated.

Claims (9)

1. 有机EL像素电路,其特征为,各像素上设有选择像素的选择晶体管;对有机EL元件所施加的驱动电流进行控制的驱动晶体管;以及使在前述有机EL元件中产生的电容上储存的电荷进行放电的放电用晶体管,前述驱动晶体管的一端连接到前述有机EL元件,前述放电用晶体管的一端连接到EL元件和前述驱动晶体管之间。 1. The organic EL pixel circuit, wherein, with selected pixels of each pixel selection transistor; on the drive current applied to the organic EL element driving transistor for controlling; and stored on the capacitance of the organic EL element produced discharging the charge discharging transistor, one end of the driving transistor being connected to the organic EL element, the EL element is connected between the discharge of the driving transistor and the one end of the transistor.
2. 根据权利要求1所述的有机EL像素电路,其特征为,前述有机EL像素实施矩阵配置,在行方向的各像素通过同一选通线选择,前述选择晶体管连接到前述选通线,前述放电用晶体管通过比选择自身的行更早的定时选择的选通线驱动,使在有机EL元件中产生的电容上储存的电荷进行;故电。 2. The organic EL pixel circuit according to claim 1, characterized in that the organic EL pixels arranged in a matrix embodiment, the pixels of each gate line selected by the row in the same direction, the select transistor is connected to the gate line, the discharge transistor is driven by its own row earlier than the selection gate line timing candidate, the charge stored on the capacitance generated in the organic EL element is carried out; it electrically.
3. 根据权利要求1所述的有机EL像素电路,其特征为,前述有机EL像素实施矩阵配置,在行方向的各像素通过同一选通线选择,前述放电用晶体管通过连接到比自身的行更前级的行的选通线的放电专用线驱动,使在有机EL元件中产生的电容上储存的电荷进行放电。 3. The organic EL pixel circuit according to claim 1, characterized in that the organic EL pixels arranged in a matrix embodiment, the pixels of each gate line selected by the same row direction, wherein the discharge transistor is connected to its own line ratio gate line further front stage discharge line dedicated line driving, the charge stored on the capacitance generated in the organic EL element is discharged.
4. 根据权利要求1或3所述的有机EL像素电路,其特征为,前述有机EL像素实施矩阵配置,各像素以各自预定的色进行发光,而且, 在以发光效率高的色发光的像素内,配置放电用晶体管,用于以发光效率低的色发光的像素。 The organic EL pixel circuit according to claim 13, wherein, the organic EL pixels arranged in a matrix embodiment, the pixels of each color to a respective predetermined emit light, and, at a high efficiency of light emission of the light emission pixels inner, discharge transistor configuration, for low luminous efficiency light emission of the pixel.
5. 根据权利要求1或3所述的有机EL像素电路,其特征为,各像素具有保持电容,用于保持对驱动晶体管的控制电压,该驱动晶体管用于对有机EL元件所施加的驱动电流进行控制,另外还有控制晶体管,用于控制在该保持电容上保持的控制电压而使前述驱动晶体管断开。 The organic EL pixel circuit according to claim 13, wherein each pixel has a storage capacitor for holding a control voltage of the driving transistor, the driving transistor for driving the organic EL element of the current applied control, in addition to a control transistor for controlling the holding of the control voltage holding capacitor so that the driving transistor is turned off.
6. 根据权利要求5所述的有机EL像素电路,其特征为,前述控制晶体管与前述放电用晶体管同时净皮驱动。 6. The organic EL pixel circuit according to claim 5, characterized in that the discharge control transistor and the driving transistor while the net skin.
7. 根据权利要求5所述的有机EL像素电路,其特征为,前述控制晶体管与比自身的行更前级的行的放电用晶体管同时被驱动。 7. The organic EL pixel circuit according to claim 5, wherein the discharge control transistor and the ratio of its further front row line are simultaneously driven stage transistor.
8. 根据权利要求5-7之一所述的有机EL像素电路,其特征为, 前述有机EL像素实施矩阵状配置,各像素以各自预定的色进行发光, 而且在以发光效率高的色发光的像素内,配置控制晶体管,用于以发光效率低的色发光的像素。 8. The organic EL pixel circuit according to one of claims 5-7, characterized in that the organic EL pixels arranged in a matrix embodiment, the pixels of each color to a respective predetermined emit light, and luminous efficiency at a high light emission within a pixel configuration control transistor for a low efficiency of light emission of the light emitting pixels.
9.有机EL像素电路,其特征为,各像素具有选择像素的选择晶体管;对供给有机EL元件的驱动电流进行控制的驱动晶体管;以及用于保持对驱动晶体管的控制电压的保持电容,该驱动晶体管用于对前述有机EL元件所施加的驱动电流进行控制,另外还有控制晶体管,用于控制在该保持电容上保持的控制电压而使前述驱动晶体管断开。 9. The organic EL pixel circuits, wherein each pixel has a selection transistor selecting a pixel; driving current supplied to the organic EL element driving transistor control; and a holding capacitor for holding the control voltage of the driving transistor, the driving a transistor for controlling the driving current applied to the organic EL element, in addition to a control transistor for controlling the holding of the control voltage holding capacitor so that the driving transistor is turned off.
CN 02104665 2001-02-15 2002-02-10 Organic electroluminescent picture element circuit CN100423058C (en)

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